TUSB2040A

4-PORT HUB FOR THE UNIVERSAL SERIAL BUS

WITH OPTIONAL SERIAL EEPROM INTERFACE

SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998

1

POST OFFICE BOX 655303

Compliant

–

Self-Powered Mode

–

Bus-Powered Mode

Reporting is Provided Ganged or Per Port

and Low-Speed Operations

Device when EXTMEM Pin is Low

Product ID With External Serial EEPROM

EEPROM Sharing

Packages

description

The TUSB2040A hub is a 3.3-V CMOS device

that provides up to four downstream ports in

compliance with the USB specification 1.0

version. Pin 21 (EXTMEM) enables or disables

the EEPROM interface. When EXTMEM is low,

the TUSB2040A is functionally equivalent to the

TUSB2040 hub and the product ID (PID)

displayed during enumeration is General Purpose

USB Hub. For this configuration, pins 9 and 10 are

the

BUSPWR

and

GANGED

input

pins,

respectively.

If programmable vendor ID(VID) and product

ID(PID) descriptors are desired, pin 21 must be

high (EXTMEM = 1) and a SGS Thompson

M93C46 or equivalent EEPROM must be

connected to pins 9 and 10. For this configuration,

the values for BUSPWR and GANGED are stored

in the EEPROM and pins 9 and 10 become the

EEPROM interface.

Copyright

© 1998, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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9

10

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28

27

26

25

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23

22

21

20

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16

15

OVRCUR2

PWRON1

OVRCUR1

DP0

DM0

GND

DP1

DM1

BUSPWR/SCL

GANGED/SDA

DP2

DM2

DP3

PWRON2

OVRCUR3

PWRON3

GND

XTAL1

XTAL2

EXTMEM

PWRON4

OVRCUR4

RESET

DM4

DP4

DM3

N PACKAGE

(TOP VIEW)

GND

XTAL1

XTAL2

NC

EXTMEM

NC

NC

PWRON4

NC

OVRCUR4

NC

RESET

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27

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25

1

2

3

4

5

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9

10

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12

DP0

DM0

GND

NC

NC

DP1

DM1

NC

NC

BUSPWR/SCL

GANGED/SDA

PT PACKAGE

(TOP VIEW)

NC

† JEDEC descriptor S–PQFP–G for thin quad flatpack (TQFP)